What is the Average of Composite Numbers upto 800?

The below workout with step by step calculation shows how to find what is the average of composite numbers between 1 and 800 manually.
step 1 Address the formula and input values.
Formula: Average = Total Sum of Numbers / Total Count of Numbers
Input values:
The composite numbers between 1 and 800 are
4, 6, 8, 9, . . . . , 798, 799, 800
Total Count of Numbers = 660

step 2 Find the sum of composite numbers between 1 and 800.
sum = 4 + 6 + 8 + . . . . + 799 + 800
= 270321

step 3 Divide the sum by 660
Average = 270321/660
= 409.5773

409.5773 is an average of composite numbers between 1 and 800.

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